vserver and failcnts in the beancounters, what to tune?

I moved a friend of mine off my root server onto another vserver as he was eating too many resources.

The vserver is using a minimal Debian 5.0 32bit image from server4you which I have upgraded to 6.0

He is on the smallest vserver available from server4you and CPU and RAM consumption is negligible. Traffic is minimal but it seems that his periodical newsletter is making him hit some limits. And I need to add, I haven't even started sending the newsletter, currently still configuring and tweaking, sending some test emails, etc.

Unfortunately not.
ts a rented vserver from server4you.
I wasn't aware of these limits when choosing this solution. I tried to remain within the RAM and CPU bounds and that works but I do have these failcounts.

I just need to know more or less what causes these so I can configure the server to avoid them :-(

for now its kind of not changing...

as I said earlier, I reduced a lot! I think the disk I/O usually happens when sending the huge newsletter... so I limited postfix for now... will soon send out the first one and see what happens...